PEP fixes

InvenTree/build/models.py

@@ -73,7 +73,6 @@ class Build(models.Model):
 
                         build_item.save()
 
-
     def __str__(self):
         return "Build {q} x {part}".format(q=self.quantity, part=str(self.part))
 
@@ -129,7 +128,6 @@ class Build(models.Model):
         """
         print("cancelled!")
 
-
     def completeBuild(self):
         """ Mark the Build as COMPLETE